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A Carnot's engine used first an ideal mo...

A Carnot's engine used first an ideal monoatomic gas then an ideal diatomic gas. If the source and sink temperature are `411^@C` and `69^@C` respectively and the engine extracts `1000J` of heat in each cycle, then area enclosed by the PV diagram is

A

`100 J`

B

300 J`

C

`500 J`

D

`700 J`

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